Vail Resorts announced the end of ski season for its North American operations on Tuesday, closing all but three resorts until the start of the 2020/21 season. Aspen Snowmass also said it would not reopen Buttermilk, Aspen Times reported, bringing the number of Colorado mountains that are shut down for the season because of COVID-19 to nine. The Vail announcement covers Vail Mountain, Beaver Creek, Breckenridge, Keystone and Crested Butte.